Fill in the blanks.

1. _______________ do not have a backbone, while _______________ have it.
2. Cnidarians have _______________ symmetrical body.
3. _______________ and _______________ live in the intestines of humans and cattle.
4. _______________ are considered as a farmer's friend.
5. Annelids have special organs called _______________ for excretion.

Fill in the blanks.

1. _______________ have paired appendages with many joints.
2. Arthropods have _______________ eyes.
3. Most arthropods have a tough outer body covering called _______________.
4. A snail belongs to the _______________ phylum.
5. Echinoderms have aa mouth on the _______________ side and an anus on the _______________ side.

Write true or false. Correct the false statements.

1. Vertebrates are animals without a backbone.
2. In fishes, fins are the organs of locomotion.
3. Birds are cold-blooded animals.
4. Amphibians can only live on land.
5. Aves have horny beaks and do not have teeth.

Tick the statements that are true for mammals.

1. They are warm-blooded animals.
2. They breathe through gills.
3. They give birth to babies.
4. They have hair on their body.  

Tick the most appropriate answer.

1. Sponges are mostly found in 
   1. distilled water.
   2. sea water.
   3. dirty water.
   4. tap water.
2. Which one of the following is not a cnidarian?
   1. pin worm
   2. Hydra
   3. jellyfish
   4. sea anemone
3. The finger-like structures present around the mouth cnidarians are called
   1. pseudopodia.
   2. tentacles.
   3. spines.
   4. bristles.
4. Annelids have a 
   1. soft, unsegmented, bilaterally symmetrical body.
   2. soft, cylindrical, segmented, bilaterally symmetrical body.
   3. soft, segmented, bilaterally symmetrical body.
   4. soft, segmented, laterally symmetrical body.
5. Which of the following has nephridia for excretion?
   1. spider
   2. tapeworm
   3. earthworm
   4. shrimp
6. Which of the following has an exoskeleton?
   1. octopus
   2. snail
   3. leech
   4. beetle
7. Scorpions and spiders are 
   1. crustaceans.
   2. arachnids.
   3. myriapods.
   4. insects.
8. The body temperature of warm-blooded animals.
   1. keeps fluctuating.
   2. changes according to the temperature of the environment.
   3. does not change with the change in the temperature of the environment.
   4. decreases when thee temperature of the environment increases.
9. Which of the following is an amphibian?
   1. turtle
   2. salamander
   3. alligator
   4. crocodile
10. Bones with large air cavities are present in _______________.
    1. cnidarians.
    2. fish.
    3. annelids.
    4. birds.
11. _______________ have four-chambered heart.
    1. Amphibians.
    2. Mammals
    3. Fish
    4. Reptiles